First, the State Statute regarding County and Municipal Utilities Authorities, in two pages, the first covering full voting members and the second alternates.
The State statute concerning appointment of full members and their terms.
The State statute regarding alternates and their term lengths.
Below is a scan of the section of the Ordinance of the City of Plainfield establishing the Plainfield Municipal Utilities Authority, its full members and alternates. (As the matter continued overleaf, the two pages have been combined into one image.)
The Plainfield Today post on which this material is discussed is here. The online Statute may be found here.